Question

1. Rusting of iron is a …………………… change.
2. The smallest part of an element that retains the properties of the element is
called……………..
3. The Sun’s heat reaches the Earth through………………..
4. The materials that conduct heat readily are called…………….
5. The S.I unit of speed is ……………………

Answer 1

Answer:

1. physical
2. atom
3. ultrasonic rays
4. match
5. metres

Answer 2

Explanation:

1. Rusting of iron is a non-periodic change.

2. The smallest part of an element that retains the properties of the element is

called atom

3. The Sun’s heat reaches the Earth through radiation

4. The materials that conduct heat readily are called bad conductors

5. The S.I unit of speed is m/s